Instrument fixation device for depth and angle fixation

ABSTRACT

An instrument fixation device includes a retaining ring, a ball joint disposed within and movable relative to the retaining ring, and a locking mechanism. The ball joint defines a channel configured to receive an instrument therethrough. The locking mechanism includes a locking sleeve and a lock. The locking sleeve is at least partially disposed within the retaining ring and engages the outer surface of the ball joint. When the locking mechanism is in an unlocked position, the ball joint is free to move within the retaining ring and when the locking mechanism is in a first locked position, the locking sleeve engages the outer surface of the ball joint to fix the ball joint relative to the retaining ring.

BACKGROUND

1. Technical Field

The present disclosure relates to surgery and, more specifically, toinstrument fixation devices to fix the depth and angle of an instrumentpassed through a channel of the device.

2. Discussion of Related Art

This present disclosure relates to devices and methods for performingsurgical procedures including minimally invasive surgical procedures(e.g., laparoscopic or endoscopic surgical procedures). Moreparticularly, the present disclosure relates to devices and methods forfixing the position of an instrument during a surgical procedure.

Minimally invasive surgical instruments and methods have been developedfor treating tissue that are less intrusive and less traumatic. Forexample, with one known technique, the surgeon makes a few smallincisions in the abdomen and inserts one or more elongated surgicalinstruments, e.g., electrosurgical instruments, forceps, scissors, clipappliers, staplers, etc., into the incision and carefully manipulatesthe instruments while viewing the operating area through an endoscope orlaparoscope.

Minimally invasive surgical procedures require a surgeon to insertdifferent instruments through a surgical site (e.g., an incision ornatural orifice) to perform the surgical procedure. During insertion andoperation of the instruments, it may be necessary to hold a surgicalinstrument steady within the surgical site. Traditionally, a surgeonwould use one hand to hold the instrument in place within the surgicalsite to fix the depth and angle of the surgical instrument within thesurgical site. When additional instruments are used during a surgicalprocedure, two or more people may be required to complete the surgicalprocedure to steady the instruments. Surgeries that require two peopleare generally more expensive and the potential for error is increased.Hence, it is desirable to modify a procedure so that it may be performedwith one or two hands, if possible.

Accordingly, there is a need for a device for use during a surgicalprocedure to fix the angle and depth of a surgical instrument within asurgical site that would facilitate operation of multiple surgicalinstruments by a single practitioner.

SUMMARY

In an aspect of the present disclosure, an instrument fixation deviceincludes a retaining ring, a ball joint, and a locking mechanism. Theball joint has an outer surface that is disposed within and moveablerelative to the retaining ring. The ball joint defines a channeltherethrough. The locking mechanism includes a locking sleeve and alock. The locking sleeve is partially disposed within the retaining ringand is engagable with the outer surface of the ball joint. The lockincludes an engagement portion configured to engage the outer surface ofthe ball joint. In an unlocked position of the locking mechanism, theball joint is free to move within the retaining ring. In a first lockedposition of the locking mechanism, the locking sleeve engages the outersurface of the ball joint fixing the ball joint relative to theretaining ring.

In some aspects, the instrument fixation device includes a positionsensor that is configured to provide an indication of the location ofthe device relative to a surgical site. The position sensor may bedisposed on or in the retaining ring. Additionally or alternatively, theinstrument fixation device includes an angular sensor that is configuredto provide an indication of the orientation of the ball joint relativeto the retaining ring. The position sensor may be disposed on or in theball joint or the retaining ring.

In certain aspects, the instrument fixation device includes a malleablepad fixed to a bottom surface of the retaining ring. The malleable padmay include a plurality of wings extending radially away from theretaining ring. One or more of the plurality of wings may define asuture hole configured to receive a suture that secures the device to apatient. The malleable pad may have anti-microbial properties.

In aspects, the ball joint has an unsecured configuration such that asurgical instrument is free to slide and rotate within the channel and asecured configuration such that the surgical instrument is fixed withinthe channel relative to the ball joint. The ball joint may include twoor more lobes. The channel may be a deformable channel such that in theunsecured configuration, the deformable channel is undeformed and in thesecured configuration, the deformable channel is deformed. The lockingmechanism may include a second locked position such that the lockingsleeve engages the outer surface of the ball joint to fix the ball jointrelative to the retaining ring and to deform the deformable channel.

In some aspects, the ball joint is moveable in six degrees of freedomrelative to the retaining ring. The lock may provide tactile feedback toa clinician when the locking mechanism transitions from the unlockedposition to the first locked position. The lock may engage the lockingsleeve to engage the locking sleeve with the ball joint.

In another aspect of the present disclosure, a surgical navigationsystem includes a surgical instrument and an instrument fixation device.The instrument fixation device may be any of the instrument fixationdevices disclosed herein.

In some aspects, the instrument fixation device includes an instrumentsensor that is configured to provide an indication of a length of thesurgical instrument extending through the channel and into a surgicalsite. The surgical instrument may have a distal end portion that extendsfrom the channel of the ball joint and into the surgical site. Theinstrument fixation device may include a position sensor that isconfigured to provide an indication of the position of the instrumentfixation device. The system may be configured to determine a length ofthe surgical instrument extending into a surgical site from the lengthof the instrument that extends from the channel and the position of theinstrument fixation device.

In still other aspects of the present disclosure, a method forpositioning a surgical instrument within a surgical site includessecuring an instrument fixation device to a patient over a surgicalsite, inserting a length of a surgical instrument through a channel ofthe instrument fixation device and into the surgical site, determiningthe length of the surgical instrument within the surgical site, lockinga ball joint of the instrument fixation device relative to a retainingring with a locking mechanism of the instrument fixation device, andsecuring the surgical instrument relative to the ball joint. Theinstrument fixation device and the surgical instrument may be any of theinstrument fixation devices and surgical instruments disclosed herein.

In aspects, locking the ball joint relative to the retaining ringincludes moving a lock of the locking mechanism to a first lockedposition. In some aspects, securing the surgical instrument relative tothe ball joint includes moving a lock of the locking mechanism to asecond locked position.

The method may include providing an indication to a clinician when theinstrument fixation device is positioned about the surgical site beforesecuring the instrument fixation device to the patient. The instrumentfixation device may include a position sensor that provides anindication of the position of the instrument fixation device relative toa surgical site of a patient.

Further, to the extent consistent, any of the aspects described hereinmay be used in conjunction with any or all of the other aspectsdescribed herein.

BRIEF DESCRIPTION OF THE DRAWINGS

Various aspects of the present disclosure are described hereinbelow withreference to the drawings, wherein:

FIG. 1 is a perspective view of a surgical positioning system connectedto a patient, in accordance with one illustrative embodiment of thepresent disclosure, the system including a tracking module, a computer,an instrument, and an instrument securement device;

FIG. 2 is a perspective view of the instrument securement device of FIG.1;

FIG. 3 is a side, cross-sectional view taken along the line 3-3 of FIG.2 illustrating the locking mechanism in an unlocked position and achannel of the ball joint in an unsecured configuration;

FIG. 3A is an enlarged view of the indicated area of detail of FIG. 3;

FIG. 4 is a side, cross-sectional view illustrating the lockingmechanism of FIG. 3 in a first locked position and the channel in anunsecured configuration;

FIG. 4A is an enlarged view of the indicated area of detail of FIG. 4;

FIG. 5 is a side, cross-sectional view illustrating the lockingmechanism of FIG. 3 in a second locked position and the channel in asecured configuration;

FIG. 5A is an enlarged view of the indicated area of detail of FIG. 5;

FIG. 6 is a perspective view of another illustrative embodiment of aninstrument fixation device provided in accordance with the presentdisclosure including a base, a ball joint, and at locking mechanism inan first locked position; and

FIG. 7 is a side, cross-sectional view of taken along the line 7-7 ofFIG. 6 illustrating the threaded channel of the instrument fixationdevice and the locking mechanism in a first locked position.

DETAILED DESCRIPTION

In accordance with the present disclosure, a surgical positioning systemincludes an instrument fixation device that is detectable by thesurgical position system such that the position of the instrumentfixation device within a surgical environment is known by the surgicalpositioning system. The surgical positioning system may include surgicalinstruments that are positionable relative to the instrument fixationdevice such that the instrument fixation device fixes the surgicalinstrument within the surgical site. The surgical positioning system maydetermine the position of the surgical instrument within the surgicalsite based on the length of a surgical instrument inserted through theinstrument fixation device, the angle of the surgical instrumentrelative to the surgical positioning system, and the position of theinstrument fixation device.

Embodiments of the present disclosure are now described in detail withreference to the drawings in which like reference numerals designateidentical or corresponding elements in each of the several views. Asused herein, the term “clinician” refers to a doctor, a nurse, or anyother care provider and may include support personnel. Throughout thisdescription, the term “proximal” refers to the portion of the device orcomponent thereof that is closest to the clinician and the term “distal”refers to the portion of the device or component thereof that isfarthest from the clinician.

Referring now to FIG. 1, a surgical positioning system 100 is providedin accordance with the present disclosure and includes an instrumentfixation device 10, a tracking module 102, reference sensors 106, areference mat 108, and a surgical instrument 120. The surgicalpositioning system 100 is configured to determine the position of thesurgical instrument 120 within a surgical site of the patient P.

The tracking module 102 may utilize a Six Degrees Of Freedom (SDOF)electromagnetic position measuring system according to the teachings ofU.S. Pat. No. 6,188,355 and published PCT Application Nos. WO 00/10456and WO 01/67035, which are incorporated herein by reference. Thereference mat 108 may be an electromagnetic filed transmitter positionedbeneath the patient “P.” The reference sensors 106 are placed on thepatient “P” such that their location within the electromagnetic fieldgenerated by the reference mat 108 can be detected. The location of eachsensor 106 is determined in and sent to tracking module 102. One ofskill in the art will recognize that the tracking module 102 may beincorporated into a computer 104 as a software component and need not bea separate component as depicted in FIG. 1.

The instrument fixation device 10 is configured to secure to the skin ofthe patient P about a surgical site and provide an indication of itsposition to the tracking module 102. The surgical site may be a naturalorifice or an incision in the skin of a patient. The surgicalpositioning system 100 may use the position of the instrument fixationdevice 10 to determine the position of the surgical instrument 120within the surgical site as detailed below.

With reference to FIGS. 2 and 3, the instrument fixation device 10includes a base 12, a ball joint 20, and a locking mechanism 30. Thebase 12 includes a malleable pad 13 and a retaining ring 16. Themalleable pad 13 may be integrally formed with the retaining ring 16.Alternatively or additionally, the malleable pad 13 may be secured tothe retaining ring 16 with adhesive or fasteners 16 a. The malleable pad13 includes two or more wings 14 configured to secure the device 10 tothe skin of the patient P. The malleable pad 13 may be constructed of asoft material. The malleable pad 13 may have an anti-microbial coatingor be made entirely of an anti-microbial material to reduce the risk ofbacterial infection at the surgical site. One or more of the wings 14may define a suture hole 15 through the upper and lower surface thereofsuch that a clinician may pass a suture (not shown) through the suturehole 15 to secure the instrument fixation device 10 to the patient.Alternatively or additionally, the lower surface of the malleable pad 13may include an adhesive 13 a to secure the instrument fixation device 10to the patient.

The ball joint 20 is disposed within a through passage 19 defined by theretaining ring 16. The ball joint 20 is substantially spherical in shapeand may include a flattened upper surface 21. The ball joint 20 isconfigured to move within the retaining ring 16 and may be moveable inSDOF relative to the retaining ring 16. The ball joint 20 defines athrough channel 24 and includes two or more lobes 22 and a lower ring23. The lobes 22 are integrally formed with the lower ring 23 andpositioned radially about the channel 24. The channel 24 is configuredto receive an instrument I (e.g., instrument 120). The flattened uppersurface 21 may define a depression 26 about the channel 24 to guide theinstrument “I” into the channel 24.

With particular reference to FIGS. 3 and 3A, the retaining ring 16includes a base flange 17 and a ring portion 18. The retaining ring 16and the malleable pad 13 define the through passage 19 substantiallyorthogonal to the base flange 17 and the malleable pad 13 to provideaccess to the surgical site through the instrument fixation device 10.The ring portion 18 may include a retention finger 18 a extendingtowards the through passage 19 adjacent an upper surface thereof. Theretention finger 18 a is configured to secure the ball joint 16 and thelocking mechanism 30 to the base 12.

The locking mechanism 30 includes a locking sleeve 32 and a lock 36. Thelocking sleeve 32 is disposed within the ring portion 18 of theretaining ring 16 and is secured by the retention finger 18 a. A portionof the ring portion 18 includes a lock mount 35. The locking sleeve 32is positioned within the retaining ring 16 and includes locking fingers33 extending upward about the outer surface of the ball joint 20. Thelocking sleeve 32 may be in contact with the outer surface of the balljoint 20 such that the locking fingers 33 retain the ball joint 20 whilepermitting the ball joint 20 to move within the locking mechanism.

Referring now to FIGS. 3 and 3A, the lock 36 may be a lever including anengagement portion 37, a pivot 38, and a tab 39. The lock mount 35secures the lock 36 to the ring portion 18. The engagement portion 37 isconfigured to contact the outer surface of the locking sleeve 32. Thedistal tip 37 a of the engagement portion 37 may be contoured to conformto the shape of the outer surface of the locking sleeve 32. The pivot 38is substantially aligned in a plane C_(p) with the center of rotationC_(r) of the ball joint 20.

With reference to FIGS. 3-5A, the locking mechanism has an unlockedposition (FIG. 3), a first locked position (FIG. 4), and a second lockedposition (FIG. 5). In the unlocked position of the locking mechanism 30,shown in FIGS. 3 and 3A, the ball joint 20 is moveable within thelocking sleeve 32 and the channel 24 is in an unsecured configurationsuch that a surgical instrument is insertable through the channel 24(i.e., the surgical instrument “I” is free to slide or rotate within thechannel 24). In the unlocked position, the locking sleeve 32 maypartially frictionally interfere with the ball joint 20 such that theball joint 20, and instrument “I” inserted therethrough, are retained inposition relative to the retaining ring 16 until an external force isapplied to the ball joint 20 or instrument “I” (e.g., the ball joint 20resists environmental forces but is free to move within the retainingring 16 in response to force applied by a clinician). The locking sleeve32 may engage the engagement portion 37 to bias the locking mechanism 30into the unlocked position when the lock 36 is between the unlockedposition and the first locked position. As represented by arrow F₁ inFIG. 3, a clinician engages the tab 39 of the lock 36 to transition thelocking mechanism 30 to the first locked position.

In the first locked position of the locking mechanism 30, shown in FIGS.4 and 4A, the ball joint 20 is fixed relative to the locking sleeve 32and the channel 24 is in the unsecured configuration. In the firstlocked position, the lock 36 may be substantially parallel to the baseflange 17. The engagement portion 37 of the lock 36 engages the outersurface of the locking sleeve 32 such that the contour of the distal tip37 a matches the contour of the outer surface of the ball joint 20 tomaintain the locking mechanism 30 in the first locked position. Theengagement of the distal tip 37 a with the locking sleeve 32 may provideindicia to a clinician (e.g., tactile feedback) that the lockingmechanism 30 is in the first locked position.

As represented by arrow F₂ in FIG. 4, a clinician engages the tab 39 ofthe lock 36 to transition the locking mechanism 30 from the first lockedposition to the second locked position. In the second locked position ofthe locking mechanism 30, shown in FIGS. 5 and 5A, the ball joint 20 isfixed relative to the locking sleeve 32 and the channel 24 is in asecured configuration such that a surgical instrument “I” is fixedwithin the channel 24 (i.e., the surgical instrument “I” is preventedfrom sliding or rotating within the channel 24). The channel 24 of theball joint 20 may be a deformable channel. In the second lockedposition, the locking sleeve 32 may urge the lobes 22 inward deformingthe channel 24 to fix the surgical instrument “I” within the channel 24.The locking sleeve 32 may engage the engagement portion 37 to bias thelocking mechanism 30 into the second locked position when the lock 36 isbetween the first locked position and the second locked position.

With particular reference to FIGS. 5 and 5A, the instrument fixationdevice 10 may include one or more sensors 19 a-d to provide anindication of a position of or a condition of the instrument fixationdevice 10. A position sensor 19 a may provide an indication of theposition of the instrument fixation device 10 relative to the referencepad 108 (FIG. 1) or the sensors 106 (FIG. 1). The instrument fixationdevice 10 may include a plurality of position sensors 19 a positioned onor within the instrument fixation device 10 (e.g., a sensor 19 a may beassociated with each wing 14, with the retaining ring 16, or with theball joint 20). The tracking module 102 may determine the position ororientation of the instrument fixation device 10 from the positions ofthe plurality of position sensors 19 a relative to the reference mat108. In addition, the locking mechanism 30 may include a lock sensor 19b to provide an indication of the position of the locking mechanism 30to the tracking module 102. Further, one or more angular sensors 19 cmay be associated with the ball joint 20 to provide an indication of thealignment of the channel 24 relative to the retaining ring 16. Moreover,an instrument sensor 19 d may be operatively associated with the channel24 to provide an indication of the presence of an instrument within thechannel 24 (e.g., the instrument I) and/or the condition of the channel24 (i.e., secured or unsecured). The instrument sensor 19 d may alsoprovide an indication of a length of an instrument extending through thechannel 24 and into the surgical site. The instrument sensor 19 d maydetect reference points on an outer surface of an instrument insertedthrough the channel 24 or the instrument sensor 19 d may have a roller(not shown) that engages the outer surface of an instrument insertedthrough the channel 24. It is within the scope of this disclosure thateach of the sensors 19 provide an indication as detailed above withrespect to sensors 19 a-d.

The tracking module 102 may be configured to determine the position of asurgical instrument within the surgical site. For example, the trackingmodule 120 may receive an indication of the position of the instrumentfixation device 10, the orientation of the instrument fixation device10, the alignment of the channel 24 relative to the instrument fixationdevice 10, and the length of the instrument 120 extending from thechannel 24 to determine the position of the surgical instrument 120within the surgical site. The tracking module 102 may receive a signalfrom one or more of the sensors 19 providing an indication of a positionof or a condition of the instrument fixation device 10. The trackingmodule 102 may receive a signal for one or more of the sensors 19 a-dand the sensors 106 by a direct (i.e., wired connection) or a wirelessconnection. The wireless connection may be via radio frequency, optical,WIFI, Bluetooth®, creating personal area networks (PANs)), etc. It iswithin the scope of this disclosure that the instrument I may act as anantenna for the sensors 19 a-d.

With reference to FIGS. 1-5A, the reference pad 108 is placed on asurgical table 110. The reference pad 108 may be integral to thesurgical table 110. A patient is positioned on the surgical table 110over the reference pad 108. The plurality of sensors 106 are positionedat reference points on the patient P. The plurality of sensors 106provides an indication of the alignment of the patient P relative to thesurgical table 110 to the tracking module 102. The tracking module 102may align presurgical scans (e.g., X-rays, CT scans, MRIs, etc.) of thepatient with the alignment of the patient P on the surgical table 110.

The instrument fixation device 10 is positioned and orientated about thesurgical site of the patient P. The tracking module 102 or computer 104may determine the surgical site from the alignment of the patient P onthe surgical table 110 and from the presurgical scans. The trackingmodule 102 may receive a signal from one or more sensors 19 a-d of theinstrument fixation device 10 while the instrument fixation device 10 ispositioned about the surgical site and provide an indication to theclinician when the instrument fixation device 10 is positioned andorientated about the surgical site. When the instrument fixation device10 is positioned and orientated about the surgical site, a cliniciansecures the instrument fixation device 10 to the patient P as detailedabove with the locking mechanism 30 of the instrument fixation device 10in an unlocked position.

An instrument (e.g., instrument 120) is inserted through the channel 24of the instrument fixation device 30. The channel 24 of the instrumentfixation device 10 is aligned in a desired orientation relative to thesurgical site. The desired orientation of the channel 24 may bepredetermined from the presurgical scans. An indication of the alignmentof the channel 24 with the surgical site is provided to the trackingmodule 102 by sensors 19 a-d. The channel 24 may be aligned before orafter the instrument is inserted through the channel. When the channel24 is aligned before the instrument is inserted through the channel 24,the locking mechanism 30 is locked in the first locked position to fixthe channel 24 relative to the surgical site before the instrument isinserted through the channel 24. When the channel 24 is aligned afterthe instrument is inserted through the channel 24, the instrument may beused to align the channel 24 before the locking mechanism 30 is lockedin the first locked position. When locking mechanism 30 is in the firstlocked position with the instrument inserted through the channel 24, alength of the instrument is inserted through the channel 24 to a desireddepth within the surgical site. The desired depth may be predeterminedfrom the presurgical scans. An indication of the length of theinstrument inserted through the channel 24 and into the surgical site isprovided to the tracking module 102 by sensors 19 a-d. When theinstrument is at the desired depth within the surgical site, the lockingmechanism 30 is locked in the second locking position to secure theinstrument within the channel 24. The tracking module 102 or thecomputer 104 may provide an indication that the instrument is at thedesired depth.

Referring to FIGS. 6 and 7, another instrument locking device 60 isprovided in accordance with the present disclosure including a base 62,a ball joint 70, and a locking mechanism 80. The base 62, the ball joint70, and the locking mechanism 80 are substantially similar to the base12, the ball joint 20, and the locking mechanism 30 detailed above withrespect to instrument locking device 10, as such only the differenceswill be detailed below for reasons of brevity. The instrument fixationdevice 60 may further include a plurality of sensors 19 a-d as detailedabove.

The base 62 includes a retaining ring 66 that defines a threaded hole81. The ball joint 70 is substantially spherical in shape and mayinclude a flattened upper surface 81. The ball joint defines a channel74 includes threads 75 for threadably receive an instrument I (e.g.,instrument 120). The length of the instrument I extending through thechannel 74 may be determined and fixed by the cooperation of the threads75 of the threaded channel 74 and threads of the instrument (not shown).The locking mechanism 80 includes a lock 86 in the form of a screw. Thelock 86 includes threads 86 a that cooperate with the threads of thethreaded hole 81 such that an engagement portion 87 of the lock 86 isconfigured to fix the ball joint 70 relative to the retaining ring 66.The engagement portion 87 may directly engage the ball joint 70 orengage a locking sleeve 82 positioned about the ball joint 70.

In an unlocked position of the locking mechanism 80, the engagementportion 87 of the lock 86 is positioned such that the ball joint 70 ismoveable within the retaining ring 66. In a first locked position of thelocking mechanism 80, the engagement portion 87 of the lock 86 engagesthe ball joint 70 to fix the ball joint relative to the retaining ring66 as detailed above.

While several embodiments of the disclosure have been shown in thedrawings, it is not intended that the disclosure be limited thereto, asit is intended that the disclosure be as broad in scope as the art willallow and that the specification be read likewise. Any combination ofthe above embodiments is also envisioned and is within the scope of theappended claims. Therefore, the above description should not beconstrued as limiting, but merely as exemplifications of particularembodiments. Those skilled in the art will envision other modificationswithin the scope and spirit of the claims appended hereto.

What is claimed:
 1. An instrument fixation device comprising: aretaining ring; a ball joint having an outer surface and disposed withinand moveable relative to the retaining ring, the ball joint defining achannel therethrough; a locking mechanism including: a locking sleeve atleast partially disposed within the retaining ring and engagable withthe outer surface of the ball joint; a lock including an engagementportion, the locking mechanism having an unlocked position, wherein theball joint is free to move within the retaining ring, and a first lockedposition, wherein the locking sleeve engages the outer surface of theball joint to fix the ball joint relative to the retaining ring.
 2. Thedevice of claim 1 further comprising a position sensor configured toprovide an indication of the location of the device relative to asurgical site.
 3. The device of claim 1 further comprising an angularsensor configured to provide an indication of the orientation of theball joint relative to the retaining ring.
 4. The device of claim 1further comprising a malleable pad fixed to a bottom surface of theretaining ring.
 5. The device of claim 4, wherein the malleable padincludes a plurality of wings extending radially away from the retainingring, at least one of the plurality of wings defining a suture holeconfigured to receive a suture to secure the device to a patient.
 6. Thedevice of claim 4, wherein the malleable pad has anti-microbialproperties.
 7. The device of claim 4, wherein a bottom surface of themalleable pad includes an adhesive layer configured to secure the deviceto a patient.
 8. The device of claim 1, wherein the ball joint has anunsecured configuration, wherein the channel is configured to slidablyand rotatably receive a surgical instrument, and a securedconfiguration, wherein the channel is configured to fix a surgicalinstrument relative to the ball joint.
 9. The device of claim 8, whereinthe ball joint includes two or more lobes and the channel is adeformable channel, wherein in the unsecured configuration thedeformable channel is undeformed and in the secured configuration, thedeformable channel is deformed.
 10. The device of claim 9, wherein thelocking mechanism includes a second locked position wherein the lockingsleeve engages the outer surface of the ball joint to fix the ball jointrelative to the retaining ring and deforms the deformable channel to thesecured configuration.
 11. The device of claim 1, wherein the ball jointis moveable in six degrees of freedom relative to the retaining ring.12. The device of claim 1, wherein the lock is configured to providetactile feedback to a clinician when the locking mechanism transitionsfrom the unlocked position to the first locked position.
 13. The deviceof claim 1, wherein the lock engages the locking sleeve to engage thelocking sleeve with the ball joint.
 14. A surgical navigation systemcomprising: a surgical instrument; an instrument fixation devicecomprising: a retaining ring; a ball joint having an outer surface anddisposed within and moveable relative to the retaining ring, the balljoint defining a channel therethrough, the surgical instrument receivedwithin the channel and extending into a surgical site; a lockingmechanism including: a locking sleeve at least partially disposed withinthe retaining ring and engagable with the outer surface of the balljoint; a lock including an engagement portion, the locking mechanismhaving an unlocked position, wherein the ball joint is free to movewithin the retaining ring and the surgical instrument is free to moverelative to the ball joint, and a first locked position, wherein thelocking sleeve engages the outer surface of the ball joint to fix theball joint relative to the retaining ring.
 15. The system of claim 14,wherein the instrument fixation device includes an instrument sensorconfigured to provide an indication of a length of the surgicalinstrument extending through the channel and into a surgical site. 16.The system of claim 14, wherein the surgical instrument includes adistal end portion extending from the channel into a surgical site, theinstrument fixation device includes a position sensor configured toprovide an indication of the position of the instrument fixation device,and wherein the system is configured to determine a length of thesurgical instrument extending into a surgical site from the length ofthe instrument extending from the channel and the position of theinstrument fixation device.
 17. A method for positioning a surgicalinstrument within a surgical site, the method comprising: securing aninstrument fixation device to a patient over a surgical site, theinstrument fixation device including: a retaining ring; and a ball jointhaving an outer surface and disposed within and moveable relative to theretaining ring, the ball joint defining a channel therethrough;inserting a length of a surgical instrument through the channel of theinstrument fixation device and into the surgical site; determining thelength of the surgical instrument within the surgical site; locking theball joint relative to the retaining ring with a locking mechanism ofthe instrument fixation device; and securing the surgical instrumentrelative to the ball joint.
 18. The method of claim 17, wherein lockingthe ball joint relative to the retaining ring includes moving a lock ofthe locking mechanism to a first locked position.
 19. The method ofclaim 17, wherein securing the surgical instrument relative to the balljoint includes moving a lock of the locking mechanism to a second lockedposition.
 20. The method of claim 17 further comprising providing anindication to a clinician when the instrument fixation device ispositioned about the surgical site before securing the instrumentfixation device to the patient, the instrument fixation device includinga position sensor that provides an indication of the position of theinstrument fixation device relative to a surgical site of a patient.